$timeout在AngularJS应用程序中没有定义错误

I have the following code:

我有以下代码:

app.factory('Position', ['$timeout', function() {

    var position = {
        latitude: 44,
        longitude: 26
    };

    console.log("Timeout started");

    $timeout(function() {
        position.latitude += 15;
        position.longitude += 15;
    }, 2000);

    return position;
}]);
app.fact